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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9aba80e2996c09b1196e2fba5f3c005a42015c87f271b5865aef6b1d7c134c' 
  AND token = '3BijIuF3pDyHCRMwXWPD5CX8l9jCkU0O1La5uDa53LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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