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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dcc187048f08f1bf4951f24a1da79a4c6b96b3124a89c98f2e73a7f2138b38e' 
  AND token = 'xAySlfoHifQfcgRP1fdwdcW7j211NRGqZhenn+LZkhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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