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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f45a91b3b1984c0265c6dddadbaf2c31b0d418c37bc4c79374c9a4620e85902' 
  AND token = 'Cok/qpW61OSThPnOwW4lHNdotKB4GHQgxiHqHSIv184=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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