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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1d345be86c5613baa64e31c9e8f976104fa5a4ec75184f0cd7445587db3ae5' 
  AND token = 'Kpi3FSwZ8+wppXkFTveduMaefHu9RwV8H9A1aqmOkfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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