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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9075db3654b26fa2ee9cb0fa0a0853fe0a8140ed52fc6553cda96d28dd1c49' 
  AND token = 'wOh6uJ15mp03cBwJQ7FPa9Ct0h6F2EIdzFOTjoESHWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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