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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f14f750b665c40f050947339310aae72ad00e618ce72753b177a4709163005d' 
  AND token = 'Rh9vqhohuJaFrDesCe+LLxUplFXlCGXOmEiC0d3amAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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