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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2083d7937809d53b274f4580ecf5c9c81bf3fbf83bf0e60e82eb6adad98172' 
  AND token = 'z2DChIuiiFtcdBobUV1vCLfc/ajevcIupTBOX5q0uoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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