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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe592609ac387c85ab702fade0c09c4fb01baa5bb9437cd374346d792082939f' 
  AND token = 'VexsFt/x3+Q2Qu6B8PLNglB25tCclRXop6Pjvgn+540=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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