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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f31390542cdd5647bad10d77391be8c0c319cfa25599cfa5b84c9655794aec' 
  AND token = 'RNY1W9jgQdDbwod3Z61MqUb2hsY84GinqrknI4Ld+vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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