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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e919c0937b8078e362cb085cea92c7e70e0c386faa28ebf698eb00e2a8534414' 
  AND token = 'hCUIVbFDQ+tmt/OHY+MlsV/I4K7WHFmoy5N0pNTsuNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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