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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27692940260539b76c6a5ff30d5b86f2fa3e7e2330867dbf302e76d4813f9835' 
  AND token = 'YD3XGGDtsodZLL3YINV5sXc4WVAXjm0khRlyH3vjJhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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