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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca17e7f3b016d2308847a6735c7f40b1ebc801d8cef72c2c34c6523ef05ced5e' 
  AND token = 'AQ8ZQE2pORg3YEzT7/V9qlRjQ7C6QQNyZVKrVoemEp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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