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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630b5c793a793fbf214dd2841e68ab8e0c91813ee5e1e077891f4ed8ee652dbc' 
  AND token = '5+11NHfiJwjrAPTu4xRhFlBAFXIXEe5ebX1bwYyNPT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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