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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c87185d54af5b5ad697d9e801bb1cdd6cca4c049dc70e654b0d3be55914b94b' 
  AND token = '8ZY32x7O1xx6jDY+plM+qrYoQxTtcUKLVJF7rll/Ucw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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