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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15f97b8ceff9551c39113341b90f898cd294620b1d229fcd38b806ce507987a' 
  AND token = 'QxXYBe3cbJuX+ha63Hra0inO6ag+pL/KA4V3iW/ptrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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