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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e10beb9c6602ca1315bf684446abd5ec8443120d27ce0925e989fbf277bb8e' 
  AND token = '2UXXfhuB484ElH8OdmvhhqJntFSTMQcxwt9QQeOX3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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