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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd98dbaa3068afeb332be354b5cb55ce9a70b5210345954439dd3f8a048637b' 
  AND token = 'hBvu+H1/Ctknm1wEyULn8k/IzsjHBhNbnCSxtHk7SxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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