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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6d1f2b8cf4536de423c158c4a6d7c0704e37393bc0df06f541fabd9150748e' 
  AND token = 'hBWVs+pJzOosU87jukrTsltnMalZz206HGqMAd2S7fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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