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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3001d55c60c31d8363756e52071e3e1e15cb7bccbf829d4d68245fa22301d64d' 
  AND token = 'mqTb87UxjY6l59OtWgivwqw7Tc4EL7uCpvZ6LVA9G8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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