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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026885303c7ef738ecba3bc00941ba37a44fe1481b6e94b819f7bd1ab493bb35' 
  AND token = 'NGQC/D5Q8qUwtcImF/Hu32qjn6C8h4T6ystIXksgdkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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