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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7745875a3979d0951a80ebd9ba70dfdd29352154178eb8e5d569420d8292f7' 
  AND token = 'FGNKPaCSS7SGUyH+yZLj13x1QiR+cAcWDl2WB8j3jb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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