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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04be871d9bdcb8f5e74a6ed9cca84de74a766c7e5c46c4ced96a034edf5b7d4d' 
  AND token = 'Hde3a9fkYyWqw8rm+MB2TxsQd3ss0yxhVzGJTbJV/dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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