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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e170894b3328c808cbed41f881bd928293817235202782e6350ae8fd7da9b3af' 
  AND token = '4frDo+WQEiE+WV+FcwwWDzm75+kIznueg7wXKSYZ8SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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