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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eb68f2f9ddd7ecb70dbe14cca814d552a418575f7ad3ee10df8f8dede0fe05' 
  AND token = 'DBHaOSWy5VaZWQwpwVMt/wqMa00Ixgtk+KWNGWTWOio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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