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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7d236ad0c7359d6b7b08724f34116bffe55cabaa2d7ed6c17546e9689105ee' 
  AND token = 'U8LvlM8XYs6bo7vp9jSgXlninUwPEA4T5+zdg1Z9EZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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