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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1b912da375040cc66c2be3d6efa19829f5036c6571dba1631d43355bc57228' 
  AND token = 'fPXtm0f+AjWG2Ouc2ZnXDuH9PuaIp7IadzBimzQFYCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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