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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c936dd7d32e8d4002f2f53293a452d5c2bd80ae61f61b0bbac3ddd50a5b37ced' 
  AND token = 'jO85VFe0DkOsxaWrdfEnI5eh24QDtm72c63yPf6Z48M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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