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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b2057b664554f64638e8ba2b806d7f77d65df92cd18d52b5732ae6cf3ec8a5' 
  AND token = '6bjp1kvQxFTF5MXdNJf79E4QfOqiv3XR//sfTvo3Dxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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