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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d8db01fa0401add47805b91df5c7f99148cd5fca2b961a23cbd59737b10542' 
  AND token = '1PeU2d7QaV1nHh76mHmOYcu/doS5bADsNFkU3M58EyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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