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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46bdfd16044e0683d149d9c47264244fb0a996d64b37e010730ad65bf1b3e736' 
  AND token = '6vjzh0HRJC7vXgXm5q4766t3HeU+h94CYx+kn1zIxPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00550

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}