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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d614ca99002ecf9c4acd34fb89866a73e36b5b8e3032b804ee861195f2f41f' 
  AND token = 'k3e/SvU2ACrvt+d2RhHEgK7Hn3bXmqXZ8xcfXXy7a7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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