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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc07fefb923c0306d1d24e8cf4363a45413dccf0049f927e36990a0c65977b9b' 
  AND token = 'Zr6ihV58TtFu8PnFkriWxJeMTT7wU9iA1hAax/Air5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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