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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75feacc4b972f546bc0c79b78f882d2c788010199b8ba574d859b898df4256a' 
  AND token = 'sSPTFV3S4znsULRkE0iLsrXaeGrkhQfKevnAdcgWWxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00600

JSON explain

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