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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e65f4355edbf367c8568e30a11141ec1459494fec9201b2e2dcf27b99ec2e9' 
  AND token = 'elwqhJoLJHRPDVyqc5sUJ1Wx0m6wcFLIJogaXWyaFF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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