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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f04eb1cd68c97d920a4102659292074c36ab0acdd2d885c074e5f62ec37895' 
  AND token = 'UFiDdEC6UXAxnuGWWrGdK1Y385/9XxaCzmPyegsQDCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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