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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c40a31eeece6aaf18c81aedda92066afaaaa17d87feda44bc1b17c00c9356f' 
  AND token = 'GKKqb1NoT7Ni+gJH9Y4RU3xaqGinyyNiguDnvw87v6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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