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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428fd8cb9066d706de1bcadf5aaacda8915001678a36ce7e4414c4d27df33e69' 
  AND token = 'WzVcv0aHQfUvU2O1dVcvr7t3Jnb+Iu87xgpJUqkof6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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