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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8059a588c3bbbfdf528457fdc5f8c30777e3754e7ca60652b01029af902cb419' 
  AND token = 'b3dd+soJOf3a19TwraVAcOHSeXJCm658VwrXYh79rfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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