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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7f9b90067c7bea09e49894e0b410ab9c838174580b6a2e0f26b5e7dca9d23f' 
  AND token = 'QQYBg9qOXwzKbF2YnTijVdZW9WSW5WWMmxdZQIuoeI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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