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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c69b7bb9bd0dcad15eb992674e6e542355f3b6acdf5a0611ead3440ce9cbbc' 
  AND token = 'kwPevVJ+PxED6yp/9Hk95ArPr8l+OXnixN75wHUNUBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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