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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53608cfda30f6effe1094a6cd41c5e559a9f0ff0e828e13d63a31a8352f660e' 
  AND token = 'y1uXG/6Psg14nfP7Y+2VbEfbL8dj4ih/fsWYL/48Onw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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