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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7072c31067741a42ce899117783571f7087e8e7fbac43075d5387c90fc90d9b7' 
  AND token = '5hUv4KBRxEeld7rF8Qo5uWH0kYWQIp1vSuomoiWwTyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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