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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956ddbe1dfc612c79d9ae3eafabe0f47ef7f621ee803d9ee6801710c9f0172af' 
  AND token = '5X+dCnSZ9I11WNZLm9zNO6sNUzTPcSrXl2khak93z0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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