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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0eff5790399c27ef181cfbf53614a1234064f1c047efc580f00cb777e51236' 
  AND token = 'GkHgYUwkanILh3pGRxLijeA9qnajb2pS/4yJyYtBmSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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