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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acf62cb9ba53879929480a594e6329cbf8e8fe9f0e8340ae28f0dab80992ab4' 
  AND token = 'b/P6qfgMXGbUaTPdBZBChGa1CztaHm7SFbnqtudoPHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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