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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed8505c8ce3dbd5e92b9a72caec54f0dfb01f1812164972a7e1ce5f25cd3dae' 
  AND token = 'aS19IzjMoTrUPGWEohJ203VlnDydKz8jzidhSdkEipg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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