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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3799fbbd8f8fb8f97150b7a9e253c49eb2d357c37d805182998d3d2eaecf91e4' 
  AND token = '9Dkfcu78xWSz37nb/w6SLsqiUsUYn2tNcF4mj+h6U0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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