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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f5f238402e9c839e47063ff8ac6027d5d1cfc11a3d802cb92543353d40cce7' 
  AND token = '2QhQZVBSdm5xkSLFLC9hGJYaGDgy4JJdDf+DaoyzZgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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