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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bf58b61942de9f5acda90414772a3f5339721340b32ae74c94d7a5e770589e' 
  AND token = 'U2nKmavFgU+FIZjNda8+ZJjoSpP1pjwLhfh15dwNi48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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