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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cfa650487f97c141346727513b353130d1d0c9cb39c6adfe434f4eae93bdca' 
  AND token = 'mqSDqL0sL/t7ZHVpSis0gvZ6BpO8HVFR0zASQSgZ2us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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