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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e118035b6c16f93532f2335db02aa18ab35cb3c30a3bb7da61a15039dec604e5' 
  AND token = 'daMnOE+h73bt19K95zI3ATtWKP/aNb6X7/Dqco0v/yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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