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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e83b9d6e19b6e620a25d4ae0a431cb951b9f843ea12a6685efdd0ac5319aca' 
  AND token = 'dw7dwbqtBsukqnTrHD9vXn2K9Uk1npFj93PpCoPZIQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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