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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d4ca7d72e28613ee9b637d4fd156cec46e41c197f1167634d03965c958e2bf' 
  AND token = '9w6plodh8asiS6yFKdHT2z8xLH68ySF+beBGBY+/QlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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