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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1b37c83d863df30ef31f27a64c02184bdc163ab4f124b5768a3706930642b2' 
  AND token = 'sv1l/gtKf1WF7MkRmvfptJGI/bdJLJ+2aZf/gnFxkoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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