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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae67172bb6d2d2ca5ab3dfe2863155c88e62a9da5b009aeb6e817173837c7bef' 
  AND token = 'XCBQgu51jcJ2zS3E/Y38oJjpOuyJ+54UOTOO7OxdMQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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