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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f355719e787106fb1775cedb682dbf44dbad12d6db829e0c5cee07aba6ec97b5' 
  AND token = 'mF5a6/rYUIB+8audSb+7yeekhxLGEFalM7wZlGIgA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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