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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef96272a04ebda71fde15ed9c88932489b78df88996e87e5ed8665fcb8fcbddd' 
  AND token = '6zddkmi/aVpIbv47eOY5lFk3Om2TkBQCzkwGwpf2Vgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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