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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ea79eeb36a7d1d4f6196ac9439d2afe48f8ae5d6b2ae4f1e920fc0f4daf5eb' 
  AND token = 'dGMM3qjDgUZ2aGF42t8uFsE1bdnKVVgIXCnDKlTtBoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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