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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c87e1867b342fa1aaffdf416835b89fa17991d33787fa9b552eaeb71a480252' 
  AND token = 'XZBkBBYT/RtmGTvx36apj1WSmAxf7xfMXHcXcWjBjo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00243

JSON explain

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