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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ce33073584c53587df76db3847138fb48f2516f564f441a45e5d88438a8bde' 
  AND token = 'bXn6Stp4vUWZONDF98KZeVzNxGNZDcIy5B1GEr+3i/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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